Optical Receiver Amplifier Front End for Diffuse Infrared Communication
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
This article describes an amplifier circuit arrangement for diffuse infrared (IR) communication which utilizes two symmetrical common base transistor amplifiers tied together at their respective bases. This design allows large photodiode areas required by IR media and provides a low noise solution. It is possible to connect personal computers (PCs) together in a local area network without the use of cables or fibers. This is achieved with technology borrowed from fiber optics without the use of a fiber, i.e., the transmitting light-emitting diodes (LEDs) and the (Image Omitted) receiving photodiodes are similar. Most IR receivers are based on fiber-optic receivers. In diffuse optical media the light enters the photodiodes from all different angles in a room.